/* Takes one or more code points. If only one code point is passed, it is
* returned as the grapheme. Otherwise, resolves it to a synthetic - either an
* already existing one if we saw it before, or a new one if not. Assumes
* that the code points are already in NFC, and as such canonical ordering has
* been applied. */
MVMGrapheme32 MVM_nfg_codes_to_grapheme(MVMThreadContext *tc, MVMCodepoint *codes, MVMint32 num_codes) {
if (num_codes == 1)
return codes[0];
else if (num_codes < MVM_GRAPHEME_MAX_CODEPOINTS)
return lookup_or_add_synthetic(tc, codes, num_codes, 0);
else
MVM_exception_throw_adhoc(tc, "Too many codepoints (%d) in grapheme", num_codes);
}
/* Initialize NFG subsystem. */
static void cache_crlf(MVMThreadContext *tc) {
MVMCodepoint codes[2] = { '\r', '\n' };
tc->instance->nfg->crlf_grapheme = lookup_or_add_synthetic(tc, codes, 2, 0);
}
/* Does the same as MVM_nfg_codes_to_grapheme, but flags the added grapheme as
* being an UTF8-C8 synthetic. */
MVMGrapheme32 MVM_nfg_codes_to_grapheme_utf8_c8(MVMThreadContext *tc, MVMCodepoint *codes, MVMint32 num_codes) {
if (num_codes == 1)
return codes[0];
else
return lookup_or_add_synthetic(tc, codes, num_codes, 1);
}
/* Gets the \r\n synthetic. */
MVMGrapheme32 MVM_nfg_crlf_grapheme(MVMThreadContext *tc) {
MVMCodepoint codes[2] = { '\r', '\n' };
return lookup_or_add_synthetic(tc, codes, 2, 0);
}